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mvvm
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| package com.example.samplemvvm | |
| import android.os.Bundle | |
| import androidx.activity.ComponentActivity | |
| import androidx.activity.compose.setContent | |
| import androidx.compose.foundation.layout.Column | |
| import androidx.compose.foundation.layout.Spacer | |
| import androidx.compose.foundation.layout.fillMaxSize | |
| import androidx.compose.foundation.layout.fillMaxWidth | |
| import androidx.compose.foundation.layout.height | |
| import androidx.compose.foundation.layout.padding | |
| import androidx.compose.material3.Button | |
| import androidx.compose.material3.MaterialTheme | |
| import androidx.compose.material3.Surface | |
| import androidx.compose.material3.Text | |
| import androidx.compose.runtime.Composable | |
| import androidx.compose.runtime.getValue | |
| import androidx.compose.runtime.mutableStateOf | |
| import androidx.compose.runtime.remember | |
| import androidx.compose.runtime.setValue | |
| import androidx.compose.ui.Modifier | |
| import androidx.compose.ui.tooling.preview.Preview | |
| import androidx.compose.ui.unit.dp | |
| import com.example.samplemvvm.ui.theme.SampleMVVMTheme | |
| import androidx.lifecycle.ViewModel | |
| import androidx.lifecycle.viewmodel.compose.viewModel | |
| class CounterViewModel : ViewModel() { | |
| var count = mutableStateOf(0) | |
| private set | |
| fun increment() { | |
| count.value++ | |
| println("incrementing count: ${count.value}") | |
| } | |
| fun decrement() { | |
| if (count.value > 0) { | |
| count.value-- | |
| } | |
| } | |
| } | |
| class MainActivity : ComponentActivity() { | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| super.onCreate(savedInstanceState) | |
| setContent { | |
| SampleMVVMTheme { | |
| // A surface container using the 'background' color from the theme | |
| Surface( | |
| modifier = Modifier.fillMaxSize(), | |
| color = MaterialTheme.colorScheme.background | |
| ) { | |
| CounterScreen() | |
| } | |
| } | |
| } | |
| } | |
| } | |
| @Composable | |
| fun CounterScreen() { | |
| // Create a reference to the ViewModel | |
| val viewModel: CounterViewModel = viewModel() | |
| Column( | |
| modifier = Modifier | |
| .fillMaxSize() | |
| .padding(16.dp) | |
| ) { | |
| Text( | |
| text = "Counter: ${viewModel.count.value}", | |
| ) | |
| Spacer(modifier = Modifier.height(16.dp)) | |
| Button( | |
| onClick = { | |
| viewModel.increment() | |
| }, | |
| modifier = Modifier | |
| .fillMaxWidth() | |
| .padding(8.dp) | |
| ) { | |
| Text(text = "Increment") | |
| } | |
| Button( | |
| onClick = { | |
| viewModel.decrement() | |
| }, | |
| modifier = Modifier | |
| .fillMaxWidth() | |
| .padding(8.dp) | |
| ) { | |
| Text(text = "Decrement") | |
| } | |
| } | |
| } | |
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